test(stdlib): Stop mocking HTTPSConnection.send in trace header tests

[alexander-alderman-webb]

Description

Emulate basic HTTP 1.1 response in HTTPSConnection subclass instead of inspecting mock.Mock arguments.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 7.74s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 14791 uncovered lines.
✅ Project coverage is 31.38%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    27.38%    31.38%       +4%
==========================================
  Files          190       190         —
  Lines        21543     21554       +11
  Branches      7182      7182         —
==========================================
+ Hits          5898      6763      +865
- Misses       15645     14791      -854
- Partials       477       571       +94

---

Generated by Codecov Action